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EP0349789A2 - Method and device for the sanitation of contaminated sites - Google Patents

Method and device for the sanitation of contaminated sites Download PDF

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Publication number
EP0349789A2
EP0349789A2 EP19890110399 EP89110399A EP0349789A2 EP 0349789 A2 EP0349789 A2 EP 0349789A2 EP 19890110399 EP19890110399 EP 19890110399 EP 89110399 A EP89110399 A EP 89110399A EP 0349789 A2 EP0349789 A2 EP 0349789A2
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EP
European Patent Office
Prior art keywords
floor
soil
cleaned
pollutants
contaminated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19890110399
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German (de)
French (fr)
Other versions
EP0349789B1 (en
EP0349789A3 (en
Inventor
Wolfgang Dipl.-Ing. Netzel
Wolfgang Dipl.-Ing.Dr. Sondermann
Albert Dipl.-Ing. Pielsticker
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Keller Grundbau GmbH
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Keller Grundbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from DE19883822747 external-priority patent/DE3822747A1/en
Application filed by Keller Grundbau GmbH filed Critical Keller Grundbau GmbH
Priority to AT89110399T priority Critical patent/ATE81693T1/en
Publication of EP0349789A2 publication Critical patent/EP0349789A2/en
Publication of EP0349789A3 publication Critical patent/EP0349789A3/en
Application granted granted Critical
Publication of EP0349789B1 publication Critical patent/EP0349789B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/02Extraction using liquids, e.g. washing, leaching, flotation

Definitions

  • the invention relates to a method for the remediation of contaminated sites according to the preamble of claim 1 and a device provided for carrying out this method according to the preamble of claim 8.
  • the invention is therefore based on the object of providing a method and a device by means of which the contaminated soil is effectively removed and replaced by cleaned soil. At the same time, this should decontaminate the soil air.
  • the invention is also based on the object to design the method and the device in such a way that the effectiveness of the transport of the fine soil constituents still containing the pollutants to the cleaning system is further increased, while at the same time ensuring a satisfactory tightness of the Transport system.
  • the possibilities for pollutant degradation, especially when removing the contaminated soil, should be increased.
  • the method according to the invention makes an important contribution to the remediation of landfills and contaminated sites. This consists in washing the contaminated soil with the aid of a high-pressure rinsing and cutting jet and thereby largely freed of toxins.
  • the flushed and pre-cleaned fine-grained soil portion is conveyed back to the surface for post-treatment, while the coarse portion of the soil remains in the treatment area.
  • the process according to the invention has the further advantage that the cutting device can also be used to clean the floor of gaseous poisons.
  • this can be achieved by adding air and / or gas to the injection means of the rinsing and cutting jet.
  • the pre-cleaning of the floor can be further increased by adding hot water and / or steam to the injection means of the rinsing and cutting jet. This can significantly increase the degree of decontamination.
  • Another particular advantage of the method according to the invention is that all processes for decontaminating the floor can be checked and regulated by a measuring and control system.
  • the invention has the further advantage that the decontamination process can be continued until the intended degree of decontamination of the floor is reached with its full load-bearing capacity.
  • the device according to the invention it is possible with the help of the high-pressure rinsing and cutting jet, which is contaminated with pollutants Detach soil from its bandage and thus initiate the process of detoxification.
  • the process of flushing out the pollutants can be intensified by adding air and / or gas, for which purpose corresponding connections are provided in the line system of the high-pressure pump driving the cutting device.
  • a further advantage of removing the pollutants according to the invention is that connections for hot water and / or steam are provided in the line system of the high-pressure pump driving the cutting device.
  • the success of the method according to the invention can be guaranteed by the measuring and control system provided in the device. With the help of this system it is possible to check, register and regulate the degree of decontamination at any time.
  • the method and the device according to the invention have the significant advantage that they can also be used under existing buildings, with full maintenance of the building structure.
  • the effectiveness of the transport of the already pre-cleaned soil, which still contains contaminants, to the cleaning system can be effectively increased by placing the preventer arranged in the backflow under suction to draw in the pollutants.
  • a preventer as is known, is a gas and watertight borehole closure with a device for rod passage and a closable, adjustable opening.
  • This negative pressure generated and maintained in the preventer provides, in addition to the transport aid provided, the further significant advantage that the fine portion of the through-passed through Soil contained in gaseous state Pollutants are kept inside the preventer and cannot escape into the atmosphere outside, but instead are fed to the cleaning system together with the fine soil content that has passed through. In this way, the desired occupational and emission protection is ensured at any time.
  • This method according to the invention is accomplished simply by means of the device provided according to the invention in that a vacuum pump is connected to the preventer arranged in the backflow. This constantly sucks in the pollutants, so that the construction site personnel and the environment are protected from the pollutants still contained in the fine soil fraction.
  • Biomass which is added to the line system for the rinsing and cutting jet via a corresponding connection, so that it is thereby possible for the contaminated soil mass released by the rinsing and cutting jet to be uniform with the biomass to the predetermined desired extent to mix.
  • This biomass consists essentially of microorganisms which are adapted to the pollutants to be degraded in the contaminated soil, in such a way that the pollutants in question are broken down or converted and thereby destroyed in the desired manner.
  • biomass it is also possible to add the biomass to the cleaned soil shortly before or during its backwashing into the borehole, this addition being possible in addition to the addition of biomass to the rinsing and cutting jet or instead.
  • This admixture of biomass to the cleaned soil is expediently carried out via an additional line which connects the connection for the addition of biomass to the pipe system for returning the cleaned soil into the borehole.
  • a vertical or otherwise inclined bore 2 is sunk into the contaminated soil 1 by means of a drilling device 21.
  • a cutting device 4 is then arranged in this bore 2, which is connected via a pipe system 14 a high-pressure pump 15 can be driven and is arranged in the bore 2 can be raised and lowered and rotated.
  • the cutting device 4 generates at its lower end a high-energy rinsing and cutting jet 3. This removes the contaminated soil 1 from its composite and rinses it so intensively that it is largely freed of the adhering pollutants.
  • the fine fraction of the flushed and pre-cleaned soil is passed through a preventer 6 together with the dissolved pollutants as a soil-rinsing mixture 7 and conveyed by a pump 8 to a cleaning system 9 - for the purpose of post-treatment.
  • the fine soil fraction is freed of the remaining pollutants, while the rough fraction of the soil remains in the treatment area.
  • the floor 10 cleaned in the cleaning system 9 is conveyed back into the bore 2 via a corresponding line system 11 with the addition of binders 12, for example cement, and forms a stable floor structure 13 there.
  • binders 12 for example cement
  • the binder 12 is added to a mixing system 22 which serves for the metered addition of the binder 12 to the cleaned floor 10 and for mixing these two constituents.
  • connections for air 16, gas 17, hot water 18 and steam 19 are arranged in the suction line of the line system 14 of the high-pressure pump 15 in order to thereby support the process of decontaminating the floor 1.
  • a measuring and control system 20 is provided, which is connected downstream of the preventer 6 in the exemplary embodiment shown and is used to continuously determine, control and regulate the respective extent of the contamination of the contaminated soil 1 in the backflow 5. This process is continued until the desired level of decontamination is achieved with the floor fully load-bearing.
  • the modified embodiment according to FIG. 2 differs from that according to FIG. 1 inter alia in that a vacuum pump 6a is connected to the preventer 6, which puts the preventer 6 under vacuum or negative pressure.
  • a vacuum pump 6a is connected to the preventer 6, which puts the preventer 6 under vacuum or negative pressure.
  • the pollutants contained in the backflow 5 are always sucked inwards and therefore cannot escape into the atmosphere. In this way, the site personnel and the environment are protected from the pollutants.
  • the negative pressure prevailing in the preventer 6 causes the return stream 5 to be transported out of the bore 2 is uniformized and is therefore not subject to interference.
  • a connection for the addition of biomass 19a is provided in the line system 14. This makes it possible to add the desired amount, concentration, etc. of the contaminated soil 1 to the contaminated soil 1 when detaching, while at the same time a uniform mixing takes place due to the rinsing and cutting jet 3, so that the biomass 19a in the contaminated soil 1 develop their full effect and can biochemically break down or convert the pollutants.
  • connection provided for the addition of biomass 19a is also connected via an additional line 23 to the line system 11 used for returning the cleaned floor 10 into the bore 2. This makes it possible to also add the biomass 19a to the cleaned floor 10, shortly before or during its backwashing into the bore 2.

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  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Bei einem Verfahren sowie einer Vorrichtung zur Sanierung kontaminierter Standorte wird der verunreinigte Boden 1 durch einen Hochdruckspül- und -schneidstrahl 3 einer in einer Bohrung 2 angeordneten Schneideinrichtung 4 vorgerei­nigt. Hierbei wird er aus seinem Verbund herausgelöst und so intensiv durchspült, daß er zum größten Teil von den an­haftenden Schadstoffen befreit wird. Der Feinanteil des durchspülten und vorgereinigten Bodens wird zusammen mit den Schadstoffen als Boden-Spül-Gemisch 7 im Rückstrom 5 durch einen Preventer 6 geschleust und zur Nachbehandlung zu einer Reinigungsanlage 9 gefördert, in der er von den restlichen Schadstoffen befreit wird, während der Groban­teil des Bodens im Behandlungsbereich verbleibt. Schließ­lich wird der in der Reinigungsanlage 9 nachgereinigte Bo­den 10 unter Zugabe von Bindemitteln 12 in die Bohrung 2 zurückgespült, wo er eine tragfähige Bodenstruktur 13 aus­bildet.

Figure imgaf001
In a method and a device for the remediation of contaminated sites, the contaminated soil 1 is pre-cleaned by a high-pressure washing and cutting jet 3 from a cutting device 4 arranged in a bore 2. Here it is detached from its composite and flushed so intensively that it is largely freed of the adhering pollutants. The fine fraction of the flushed and pre-cleaned soil is passed together with the pollutants as a soil-rinsing mixture 7 in the backflow 5 through a preventer 6 and conveyed to a cleaning system 9 for aftertreatment, in which it is freed of the remaining pollutants, while the coarse fraction of the Remains in the treatment area. Finally, the floor 10 cleaned in the cleaning system 9 is flushed back into the bore 2 with the addition of binders 12, where it forms a stable floor structure 13.
Figure imgaf001

Description

Die Erfindung betrifft ein Verfahren zur Sanierung kontami­nierter Standorte gemäß dem Oberbegriff des Anspruchs 1 so­wie eine zur Durchführung dieses Verfahrens vorgesehene Vorrichtung gemäß dem Oberbegriff des Anspruchs 8.The invention relates to a method for the remediation of contaminated sites according to the preamble of claim 1 and a device provided for carrying out this method according to the preamble of claim 8.

Um kontaminierte Standorte zu sanieren, ist schon ein Ver­fahren bekannt (DE-PS 33 30 897), bei dem die Einschließung von Deponien mit Hilfe einer hydraulischen Räum- und Injektionseinrichtung erfolgt.In order to clean up contaminated sites, a method is already known (DE-PS 33 30 897), in which landfills are enclosed with the aid of a hydraulic clearing and injection device.

Durch dieses an sich sehr bewährte Verfahren ist es jedoch nicht möglich, einen kontaminierten Boden an gezielter Stelle zu extrahieren, wirkungsvoll von den anhaftenden Schadstoffen zu reinigen und sodann den gereinigten Boden im sanierten Standort wieder abzulagern.However, this method, which is very well-proven per se, does not make it possible to extract a contaminated soil at a targeted point, to effectively remove the adhering pollutants, and then to deposit the cleaned soil again in the remediated site.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren sowie eine Vorrichtung zu schaffen, mittels denen der kontaminierte Boden wirkungsvoll herausgelöst und durch gereinigten Boden ersetzt wird. Gleichzeitig soll hierdurch die Bodenluft dekontaminiert werden.The invention is therefore based on the object of providing a method and a device by means of which the contaminated soil is effectively removed and replaced by cleaned soil. At the same time, this should decontaminate the soil air.

Der Erfindung liegt außerdem die Aufgabe zugrunde, das Verfahren sowie die Vorrichtung derart auszugestalten, daß die Wirksamkeit des Transports der noch die Schadstoffe enthaltenden Bodenfeinbestandteile zur Reinigungsanlage weiter gesteigert wird, und zwar unter gleichzeitiger Gewährleistung einer zufriedenstellenden Dichtheit des Transportsystems. Außerdem sollen die Möglichkeiten zum Schadstoffabbau, insbesondere bereits beim Herauslösen des kontaminierten Bodens, vergrößert werden.The invention is also based on the object to design the method and the device in such a way that the effectiveness of the transport of the fine soil constituents still containing the pollutants to the cleaning system is further increased, while at the same time ensuring a satisfactory tightness of the Transport system. In addition, the possibilities for pollutant degradation, especially when removing the contaminated soil, should be increased.

Das erfindungsgemäß geschaffene Verfahren löst diese Auf­gabe mit den Merkmalen des Anspruchs 1. Vorteilhafte Ausge­staltungen hiervon sind in den Ansprüchen 2 bis 7 angege­ben.The method created according to the invention achieves this object with the features of claim 1. Advantageous refinements thereof are specified in claims 2 to 7.

Die zur Durchführung dieses Verfahrens geschaffene Vorrich­tung gemäß der Erfindung ist durch die Merkmale des An­spruchs 8 gekennzeichnet. Zweckmäßige Ausgestaltungen hier­von sind in den weiteren Ansprüchen beschrieben.The device created according to the invention for carrying out this method is characterized by the features of claim 8. Appropriate configurations thereof are described in the further claims.

Das erfindungsgemäße Verfahren stellt einen wesentlichen Beitrag zur Sanierung von Deponien und Altlasten dar. Die­ser besteht darin, daß der belastete Boden mit Hilfe eines Hochdruckspül- und -schneidstrahles gewaschen und dadurch von Giftstoffen weitgehend befreit wird.The method according to the invention makes an important contribution to the remediation of landfills and contaminated sites. This consists in washing the contaminated soil with the aid of a high-pressure rinsing and cutting jet and thereby largely freed of toxins.

Der durchspülte und vorgereinigte feinkörnige Bodenanteil wird im Rückstrom an die Oberfläche zur Nachbehandlung ge­fördert, während der Grobanteil des Bodens im Behandlungs­bereich verbleibt.The flushed and pre-cleaned fine-grained soil portion is conveyed back to the surface for post-treatment, while the coarse portion of the soil remains in the treatment area.

Auf dem Gebiet der Hochdrucktechnik ist zwar schon eine Schneid- und Injektionseinrichtung bekannt (DE-OS 36 44 766). Diese dient jedoch nur dazu, aus einem nichttragfähi­gen Boden einen Bodenanteil aus seinem natürlichen Verbund herauszulösen und durch einen aus nachgeführten Feststoffen gefertigten Tragkörper zu ersetzen.In the field of high-pressure technology, a cutting and injection device is already known (DE-OS 36 44 766). However, this only serves to remove a portion of the soil from its natural composite from a non-load-bearing floor and to replace it with a support body made from tracked solids.

Demgegenüber wird jedoch bei dem Verfahren gemäß der Erfin­dung eine derartige an sich bekannte Schneideinrichtung zur noch im boden selbst erfolgenden vorteilhaften Vorreinigung des kontaminierten Bodens verwendet. Der feinkörnige Boden­anteil des durchspülten und vorgereinigten Bodens wird in einer Reinigungsanlage von den restlichen Schadstoffen be­freit und unter Zugabe von Bindemittel, beispielsweise Ze­ment, in die Bohrung zurückgespült. Dort bildet sich eine tragfähige Bodenstruktur aus dem mit dem Bindemittel ver­mischten gereinigten Feinanteil des Bodens zusammen mit dem im Boden verbliebenen gereinigten Grobanteil einschließlich Wasser aus.In contrast, however, such a cutting device known per se is used in the method according to the invention for the advantageous pre-cleaning of the contaminated soil which is still taking place in the soil itself. The fine-grained floor part of the flushed and pre-cleaned floor is in freed from the remaining pollutants in a cleaning system and flushed back into the borehole with the addition of binding agents, for example cement. There a stable soil structure is formed from the cleaned fine portion of the soil mixed with the binder together with the cleaned rough portion remaining in the soil including water.

Das erfindungsgemäße Verfahren weist den weiteren Vorteil auf, daß mit Hilfe der Schneideinrichtung auch die Reini­gung des Bodens von gasförmigen Giften erreicht werden kann. Dies kann in erfindungsgemäßer Ausgestaltung des Ver­fahrens durch Zugabe von Luft und/oder Gas zum Injektions­mittel des Spül- und Schneidstrahles erreicht werden.The process according to the invention has the further advantage that the cutting device can also be used to clean the floor of gaseous poisons. In an embodiment of the method according to the invention, this can be achieved by adding air and / or gas to the injection means of the rinsing and cutting jet.

Die Vorreinigung des Bodens kann weiter dadurch verstärkt werden, daß dem Injektionsmittel des Spül- und Schneid­strahles heißes Wasser und/oder Dampf beigemischt wird. Da­durch kann der Dekontaminationsgrad wesentlich gesteigert werden.The pre-cleaning of the floor can be further increased by adding hot water and / or steam to the injection means of the rinsing and cutting jet. This can significantly increase the degree of decontamination.

Ein weiterer besonderer Vorteil des erfindungsgemäßen Ver­fahrens besteht darin, daß alle Vorgänge zur Dekontaminie­rung des Bodens durch eine Meß- und Regelanlage kontrol­liert und geregelt werden können.Another particular advantage of the method according to the invention is that all processes for decontaminating the floor can be checked and regulated by a measuring and control system.

Die Erfindung hat den weiteren Vorteil, daß der Vorgang der Dekontaminierung so lange fortgesetzt werden kann, bis der vorgesehene Dekontaminationsgrad des Bodens bei dessen vol­ler Tragfähigkeit erreicht ist.The invention has the further advantage that the decontamination process can be continued until the intended degree of decontamination of the floor is reached with its full load-bearing capacity.

Durch die Ausbildung der erfindungsgemäßen Vorrichtung ist es mit Hilfe des Hochdruckspül- und -schneidstrahles mög­lich, den mit Schadstoffen belasteten Boden aus seinem Verband herauszulösen und damit den Vor­gang der Entgiftung einzuleiten.By designing the device according to the invention, it is possible with the help of the high-pressure rinsing and cutting jet, which is contaminated with pollutants Detach soil from its bandage and thus initiate the process of detoxification.

Der Vorgang der Ausspülung der Schadstoffe kann durch Zugabe von Luft und/oder Gas verstärkt werden, wofür im Leitungssystem der die Schneideinrichtung antreibenden Hochdruckpumpe entsprechende Anschlüsse vorgesehen sind.The process of flushing out the pollutants can be intensified by adding air and / or gas, for which purpose corresponding connections are provided in the line system of the high-pressure pump driving the cutting device.

Ein weiterer Vorteil zur Herauslösung der Schadstoffe be­steht nach der Erfindung darin, daß im Leitungssystem der die Schneideinrichtung antreibenden Hochdruckpumpe An­schlüsse für heißes Wasser und/oder Dampf vorgesehen sind.A further advantage of removing the pollutants according to the invention is that connections for hot water and / or steam are provided in the line system of the high-pressure pump driving the cutting device.

Der Erfolg des erfindungsgemäßen Verfahrens kann durch die in der Vorrichtung vorgesehene Meß- und Regelanlage garan­tiert werden. Mit Hilfe dieser Anlage ist es möglich, den Grad der Dekontaminierung zu jedem Zeitpunkt zu kontrollie­ren, zu registrieren und zu regeln.The success of the method according to the invention can be guaranteed by the measuring and control system provided in the device. With the help of this system it is possible to check, register and regulate the degree of decontamination at any time.

Das Verfahren sowie die Vorrichtung gemäß der Erfindung weisen schließlich den wesentlichen Vorteil auf, daß sie auch unter bestehender Bebauung angewendet werden können, und zwar bei voller Aufrechterhaltung der Bausubstanz.Finally, the method and the device according to the invention have the significant advantage that they can also be used under existing buildings, with full maintenance of the building structure.

Erfindungsgemäß kann die Wirksamkeit des Transports des bereits vorgereinigten, jedoch nach wie vor Schadstoffe enthaltenden Bodens zur Reinigungsanlage dadurch wirksam gesteigert werden, daß der im Rückstrom angeordnete Preventer zum Ansaugen der Schadstoffe unter Unterdruck gesetzt wird. Ein derartiger Preventer stellt, wie bekannt, einen gas- und wasserdichten Bohrlochverschluß mit einer Einrichtung zur Gestängedurchführung und einer verschließbaren, regulierbaren Öffnung dar. Dieser im Preventer erzeugte und beibehaltene Unterdruck erbringt außer der geleisteten Transporthilfe den weiteren wesentlichen Vorteil, daß die im Feinanteil des durchgeschleusten Bodens in gasförmigem Zustand enthaltenen Schadstoffe im Inneren des Preventers gehalten werden und nicht nach außen in die Atmosphäre entweichen können, sondern stattdessen zusammen mit dem durchgeschleusten Bodenfeinanteil der Reinigungsanlage zugeführt werden. Auf diese Weise wird der erwünschte Arbeits- und Emissionsschutz zu jedem beliebigen Zeitpunkt sicherge­stellt.According to the invention, the effectiveness of the transport of the already pre-cleaned soil, which still contains contaminants, to the cleaning system can be effectively increased by placing the preventer arranged in the backflow under suction to draw in the pollutants. Such a preventer, as is known, is a gas and watertight borehole closure with a device for rod passage and a closable, adjustable opening. This negative pressure generated and maintained in the preventer provides, in addition to the transport aid provided, the further significant advantage that the fine portion of the through-passed through Soil contained in gaseous state Pollutants are kept inside the preventer and cannot escape into the atmosphere outside, but instead are fed to the cleaning system together with the fine soil content that has passed through. In this way, the desired occupational and emission protection is ensured at any time.

Dieses erfindungsgemäße Verfahren wird mittels der nach der Erfindung vorgesehenen Vorrichtung einfach dadurch bewerk­stelligt, daß an den im Rückstrom angeordneten Preventer eine Vakuumpumpe angeschlossen ist. Diese saugt konstant die Schadstoffe an, so daß das Baustellenpersonal und die Umwelt vor den im Bodenfeinanteil noch enthaltenen Schadstoffen geschützt werden.This method according to the invention is accomplished simply by means of the device provided according to the invention in that a vacuum pump is connected to the preventer arranged in the backflow. This constantly sucks in the pollutants, so that the construction site personnel and the environment are protected from the pollutants still contained in the fine soil fraction.

Zusätzlich zu dieser erfindungsgemäßen Maßnahme oder auch stattdessen ist es in weiterer Ausgestaltung der Erfindung möglich, den Abbau der Schadstoffe weiter zu steigern bzw. zu verbessern. Dies erfolgt durch Verwendung von sog. Bio­masse, die über einen entsprechenden Anschluß dem Leitungs­system für den Spül- und Schneidstrahl zugegeben wird, so daß es hierdurch möglich ist, die durch den Spül- und Schneidstrahl herausgelöste kontaminierte Bodenmasse im vorgegebenen gewünschten Umfang gleichmäßig mit der Bio­masse zu durchmischen. Diese Biomasse besteht im wesentli­chen aus Mikroorganismen, die an die abzubauenden Schadstoffe des kontaminierten Bodens angepaßt sind, und zwar derart, daß die betreffenden Schadstoffe abgebaut bzw. umgewandelt und dadurch in der erwünschten Weise vernichtet werden.In addition to this measure according to the invention or instead, it is possible in a further embodiment of the invention to further increase or improve the breakdown of the pollutants. This is done by using so-called. Biomass, which is added to the line system for the rinsing and cutting jet via a corresponding connection, so that it is thereby possible for the contaminated soil mass released by the rinsing and cutting jet to be uniform with the biomass to the predetermined desired extent to mix. This biomass consists essentially of microorganisms which are adapted to the pollutants to be degraded in the contaminated soil, in such a way that the pollutants in question are broken down or converted and thereby destroyed in the desired manner.

In weiterer Ausgestaltung der Erfindung ist es auch mög­lich, die Biomasse dem nachgereinigten Boden kurz vor bzw. bei seiner Rückspülung in die Bohrung beizumischen, wobei diese Beimischung zusätzlich zur Zugabe von Biomasse zum Spül- und Schneidstrahl oder stattdessen erfolgen kann.In a further embodiment of the invention, it is also possible to add the biomass to the cleaned soil shortly before or during its backwashing into the borehole, this addition being possible in addition to the addition of biomass to the rinsing and cutting jet or instead.

Diese Beimischung von Biomasse zum nachgereinigten Boden erfolgt zweckmäßigerweise über eine zusätzliche Leitung, die den Anschluß für die Zugabe von Biomasse mit dem Lei­tungssystem zur Rückförderung des nachgereinigten Bodens in die Bohrung verbindet.This admixture of biomass to the cleaned soil is expediently carried out via an additional line which connects the connection for the addition of biomass to the pipe system for returning the cleaned soil into the borehole.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert. Diese zeigt in:

  • Fig. 1 Das Verfahren und die Vorrichtung in schematischer Darstellung, teilweise im Längsschnitt, und
  • Fig. 2 eine abgewandelte Ausführungsform hiervon.
The invention is explained in more detail below with reference to the drawing. This shows in:
  • Fig. 1 The method and the device in a schematic representation, partly in longitudinal section, and
  • Fig. 2 shows a modified embodiment thereof.

Wie aus Fig. 1 ersichtlich, wird in den kontaminierten Boden 1 eine vertikale oder ansonsten je nach den Umständen geneigte Bohrung 2 abgeteuft, und zwar mittels eines Bohrgerätes 21. In dieser Bohrung 2 wird sodann eine Schneideinrichtung 4 angeordnet, die über ein Leitungssy­stem 14 mittels einer Hochdruckpumpe 15 antreibbar ist und in der Bohrung 2 heb- und senkbar sowie drehbar angeordnet ist. Die Schneideinrichtung 4 erzeugt an ihrem unteren Ende einen energiereichen Spül- und Schneidstrahl 3. Durch diesen wird der kontaminierte Boden 1 aus seinem Verbund herausgelöst und so intensiv durchspült, daß er zum größten Teil von den anhaftenden Schadstoffen befreit wird.As can be seen from FIG. 1, a vertical or otherwise inclined bore 2, depending on the circumstances, is sunk into the contaminated soil 1 by means of a drilling device 21. A cutting device 4 is then arranged in this bore 2, which is connected via a pipe system 14 a high-pressure pump 15 can be driven and is arranged in the bore 2 can be raised and lowered and rotated. The cutting device 4 generates at its lower end a high-energy rinsing and cutting jet 3. This removes the contaminated soil 1 from its composite and rinses it so intensively that it is largely freed of the adhering pollutants.

In dem sich zur Oberfläche ergebenden Rückstrom 5 wird der Feinanteil des durchspülten und vorgereinigten Bodens zu­sammen mit den gelösten Schadstoffen als Boden-Spül-Gemisch 7 durch einen Preventer 6 geschleust und durch eine Pumpe 8 zu einer Reinigungsanlage 9 - zum Zweck der Nachbehandlung - gefördert. In dieser Reinigungsanlage 9 wird der Boden­feinanteil von den restlichen Schadstoffen befreit, während der Grobanteil des Bodens im Behandlungsbereich verbleibt.In the backflow 5 resulting to the surface, the fine fraction of the flushed and pre-cleaned soil is passed through a preventer 6 together with the dissolved pollutants as a soil-rinsing mixture 7 and conveyed by a pump 8 to a cleaning system 9 - for the purpose of post-treatment. In this cleaning system 9, the fine soil fraction is freed of the remaining pollutants, while the rough fraction of the soil remains in the treatment area.

Der in der Reinigungsanlage 9 nachgereinigte Boden 10 wird über ein entsprechendes Leitungssystem 11 unter Zugabe von Bindemitteln 12, beispielsweise von Zement, in die Bohrung 2 zurückgefördert und bildet dort eine tragfähige Boden­struktur 13 aus.The floor 10 cleaned in the cleaning system 9 is conveyed back into the bore 2 via a corresponding line system 11 with the addition of binders 12, for example cement, and forms a stable floor structure 13 there.

Wie ersichtlich, erfolgt die Zugabe des Bindemittels 12 an einer Mischanlage 22, die der dosierten Zugabe des Binde­mittels 12 zum nachgereinigten Boden 10 sowie der Mischung dieser beiden Bestandteile dient.As can be seen, the binder 12 is added to a mixing system 22 which serves for the metered addition of the binder 12 to the cleaned floor 10 and for mixing these two constituents.

Wie weiterhin aus der Zeichnung ersichtlich, sind in der Saugleitung des Leitungssystems 14 der Hochdruckpumpe 15 Anschlüsse für Luft 16, Gas 17, heißes Waser 18 und Dampf 19 angeordnet, um hierdurch den Vorgang der Dekontaminie­rung des Bodens 1 zu unterstützen.As can also be seen from the drawing, connections for air 16, gas 17, hot water 18 and steam 19 are arranged in the suction line of the line system 14 of the high-pressure pump 15 in order to thereby support the process of decontaminating the floor 1.

Schließlich ist eine Meß- und Regelanlage 20 vorgesehen, die beim dargestellten Ausführungsbeispiel dem Preventer 6 nachgeschaltet ist und dazu dient, im Rückstrom 5 das jeweilige Ausmaß der Befreiung des kontaminierten Bodens 1 von Schadstoffen stetig festzustellen, zu kontrollieren und zu regeln. Dieser Vorgang wird solange fortgesetzt, bis der gewünschte Dekontaminationsgrad bei voller Tragfähigkeit des Bodens erreicht ist.Finally, a measuring and control system 20 is provided, which is connected downstream of the preventer 6 in the exemplary embodiment shown and is used to continuously determine, control and regulate the respective extent of the contamination of the contaminated soil 1 in the backflow 5. This process is continued until the desired level of decontamination is achieved with the floor fully load-bearing.

Die abgewandelte Ausführungsform gemäß Fig. 2 unterscheidet sich von derjenigen gemäß Fig. 1 u. a. dadurch, daß an den Preventer 6 eine Vakuumpumpe 6a angeschlossen ist, die den Preventer 6 unter Vakuum bzw. Unterdruck setzt. Dadurch werden die im Rückstrom 5 enthaltenen Schadstoffe stets nach innen gesaugt und können somit nicht in die Atmosphäre austreten. Auf diese Weise werden das Baustellenpersonal und die Umwelt vor den Schadstoffen geschützt. Gleichzeitig bewirkt der im Preventer 6 herrschende Unterdruck, daß der Transport des Rückstroms 5 aus der Bohrung 2 vergleichförmigt wird und somit keinen Störungen unterliegt.The modified embodiment according to FIG. 2 differs from that according to FIG. 1 inter alia in that a vacuum pump 6a is connected to the preventer 6, which puts the preventer 6 under vacuum or negative pressure. As a result, the pollutants contained in the backflow 5 are always sucked inwards and therefore cannot escape into the atmosphere. In this way, the site personnel and the environment are protected from the pollutants. At the same time, the negative pressure prevailing in the preventer 6 causes the return stream 5 to be transported out of the bore 2 is uniformized and is therefore not subject to interference.

Außerdem ist in dem Leitungssystem 14 ein Anschluß für die Zugabe von Biomasse 19a vorgesehen. Hierdurch ist es möglich, dem verunreinigten Boden 1 beim Herauslösen Bio­masse 19a in der gewünschten Menge, Konzentration usw. zuzugeben, wobei gleichzeitig aufgrund des Spül- und Schneidstrahls 3 eine gleichmäßige Durchmischung erfolgt, so daß die Biomasse 19a im verunreinigten Boden 1 ihre volle Wirkung entfalten und die Schadstoffe biochemisch abbauen bzw. umwandeln kann.In addition, a connection for the addition of biomass 19a is provided in the line system 14. This makes it possible to add the desired amount, concentration, etc. of the contaminated soil 1 to the contaminated soil 1 when detaching, while at the same time a uniform mixing takes place due to the rinsing and cutting jet 3, so that the biomass 19a in the contaminated soil 1 develop their full effect and can biochemically break down or convert the pollutants.

Der für die Zugabe von Biomasse 19a vorgesehene Anschluß ist außerdem über eine zusätzliche Leitung 23 mit dem zur Rückförderung des nachgereinigten Bodens 10 in die Bohrung 2 dienenden Leitungssystem 11 verbunden. Hierdurch ist es möglich, die Biomasse 19a auch dem nachgereinigten Boden 10 beizumischen, und zwar kurz vor bzw. bei dessen Rückspülung in die Bohrung 2.The connection provided for the addition of biomass 19a is also connected via an additional line 23 to the line system 11 used for returning the cleaned floor 10 into the bore 2. This makes it possible to also add the biomass 19a to the cleaned floor 10, shortly before or during its backwashing into the bore 2.

Bezüglich weiterer, vorstehend nicht beschriebener Merkmale des Verfahrens sowie der Vorrichtung wird im übrigen aus­drücklich auf die Zeichnung verwiesen.With regard to further features of the method and the device not described above, reference is expressly made to the drawing.

Claims (13)

1. Verfahren zur Sanierung kontaminierter Standorte durch Extraktion des verunreinigten Bodens, Entzug der Schadstoffe sowie Wiederablagerung des gereinigten Bodens im sanierten Standort,
dadurch gekennzeichnet,
- daß der verunreinigte Boden (1) durch einen Hochdruck­spül- und -schneidstrahl (3) einer in einer vertikalen oder gegen die Vertikale geneigten Bohrung (2) angeordneten, heb- und senkbaren sowie drehbaren Schneideinrichtung (4) vorgereinigt wird, wobei er aus seinem Verband herausgelöst und so intensiv durchspült wird, daß er zum größten Teil von den anhaftenden Schadstoffen befreit wird,
- daß der Feinanteil des durchspülten und vorgereinigten Bodens zusammen mit den Schadstoffen als Boden-Spül-Ge­misch (7) im Rückstrom (5) durch einen Preventer (6) geschleust und zur Nachbehandlung zu einer Reinigungs­anlage (9) gefördert wird, in der er von den restlichen Schadstoffen befreit wird, während der Grobanteil des Bodens im Behandlungsbereich verbleibt, und
- daß der in der Reinigungsanlage (9) nachgereinigte Boden (10) unter Zugabe von Bindemittel (12), beispielsweise Zement, in die Bohrung (2) zurückgespült wird und dort eine tragfähige Bodenstruktur (13) ausbildet.
1. Procedure for the remediation of contaminated sites by extraction of the contaminated soil, removal of the pollutants and redeposition of the cleaned soil in the remediated site,
characterized by
- That the contaminated floor (1) by a high-pressure flushing and cutting jet (3) in a vertical or inclined to the vertical bore (2) arranged, liftable and lowerable and rotatable cutting device (4) is pre-cleaned, from which it The dressing is removed and flushed so intensively that it is largely freed of the adhering pollutants,
- That the fine fraction of the flushed and pre-cleaned floor together with the pollutants as a floor-rinsing mixture (7) in the return flow (5) through a preventer (6) and for post-treatment to a cleaning system (9), in which it is promoted by the remaining pollutants are removed, while the majority of the soil remains in the treatment area, and
- That in the cleaning system (9) cleaned floor (10) with the addition of binder (12), for example cement, is flushed back into the bore (2) and forms a load-bearing floor structure (13) there.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß dem Spül- und Schneidstrahl (3) zur Verstärkung der Vorreinigung des kontaminierten Bodens (1) heißes Wasser (18) und/oder Dampf (19) beigemischt werden.2. The method according to claim 1, characterized in that the rinsing and cutting jet (3) to reinforce the pre-cleaning of the contaminated floor (1) hot water (18) and / or steam (19) are added. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß dem Spül- und Schneidstrahl (3) Luft (16) und/oder Gas (17) beigemischt werden, um den kontaminierten Boden (1) von gasförmigen Giften zu reinigen.3. The method according to claim 1 or 2, characterized in that the flushing and cutting jet (3) air (16) and / or gas (17) are admixed in order to clean the contaminated soil (1) from gaseous poisons. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß alle Vorgänge zur Dekontaminierung des Bodens (1) durch eine Meß- und Regelanlage (20) kontrolliert und geregelt werden.4. The method according to any one of claims 1 to 3, characterized in that all processes for decontaminating the floor (1) are controlled and regulated by a measuring and control system (20). 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Vorgang der Dekontaminierung des Bodens (1) solange fortgesetzt wird, bis der vorgesehene Dekontaminationsgrad des Bodens bei dessen voller Tragfähigkeit erreicht ist.5. The method according to any one of claims 1 to 4, characterized in that the process of decontamination of the floor (1) is continued until the intended degree of decontamination of the floor is reached with its full load-bearing capacity. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der im Rückstrom (5) angeordnete Preventer (6) zum Ansaugen der Schadstoffe unter Unterdruck gesetzt wird.6. The method according to any one of claims 1 to 5, characterized in that the preventer arranged in the backflow (5) (6) for suction of the pollutants is placed under negative pressure. 7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß zum verstärkten Abbau der im kontaminierten Boden (1) enthaltenen Schadstoffe Biomasse (19a) zugegeben wird, die dem Spül- und Schneidstrahl (3) und/oder dem nachgereinigten Boden (10) vor bzw. bei seiner Rückspülung in die Bohrung (2) beigemischt wird.7. The method according to any one of claims 1 to 6, characterized in that for the increased degradation of the contaminants contained in the contaminated soil (1) biomass (19 a) is added, the rinsing and cutting jet (3) and / or the cleaned floor ( 10) is added to the bore (2) before or during backwashing. 8. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
daß eine durch eine Hochdruckpumpe (15) angetriebene, in einer Bodenbohrung (2) heb- und senkbare sowie drehbare Schneideinrichtung (4) vorgesehen ist, die einen Hochdruckspül- und -schneidstrahl (3) zur Vorreinigung des kontaminierten Bodens (1) erzeugt und über ein Leitungssystem (11) mit einer Reinigungsanlage (9) zur Nachbehandlung des im Rückstrom (5) als Boden-Spül-Gemisch (7) herausgeschleusten Bodenfeinanteils sowie mit einer Mischanlage (22) zur Zugabe von Bindemittel (12), beispielsweise Zement, zum nachgereinigten Boden (10) verbunden ist.
8. Device for performing the method according to one of claims 1 to 7,
characterized by
that a by a high pressure pump (15), in a bottom hole (2) can be raised and lowered and rotated cutting device (4) is provided, which a high pressure flushing and cutting jet (3) for pre-cleaning the contaminated soil (1) and via a line system (11) with a cleaning system (9) for the aftertreatment of the fine soil fraction discharged in the backflow (5) as a soil-rinsing mixture (7) and with a mixing system (22) for adding binder ( 12), for example cement, is connected to the cleaned floor (10).
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß das Leitungssystem (14) der die Schneideinrichtung (4) antreibenden Hochdruckpumpe (15) Anschlüsse für die Zugabe von heißem Wasser (18) und/oder Dampf (19) und/oder Luft (16) und/oder Gas (17) aufweist.9. The device according to claim 8, characterized in that the line system (14) of the cutting device (4) driving high pressure pump (15) connections for the addition of hot water (18) and / or steam (19) and / or air (16 ) and / or gas (17). 10. Vorrichtung nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß zur Überwachung der Vorrichtung eine Meß- und Regelanlage (20) vorgesehen ist.10. The device according to claim 8 or 9, characterized in that a measuring and control system (20) is provided for monitoring the device. 11. Vorrichtung nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, daß an den im Rückstrom (5) angeordneten Preventer (6) eine Vakuumpumpe (6a) angeschlossen ist, die den Preventer (6) unter Vakuum bzw. Unterdruck setzt.11. The device according to one of claims 8 to 10, characterized in that a vacuum pump (6a) is connected to the preventer (6) arranged in the backflow (5), which sets the preventer (6) under vacuum or vacuum. 12. Vorrichtung nach einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, daß das Leitungssystem (14) der die Schneideinrichtung (4) antreibenden Hochdruckpumpe (15) einen Anschluß für die Zugabe von Biomasse (19a) aufweist.12. Device according to one of claims 8 to 11, characterized in that the line system (14) of the cutting device (4) driving high pressure pump (15) has a connection for the addition of biomass (19a). 13. Vorrichtung nach Anspruch 12, dadurch gekennzeich­net, daß der Anschluß für die Zugabe von Biomasse (19a) über eine zusätzliche Leitung (23) mit dem Leitungssystem (11) zur Rückförderung des nachgereinigten Bodens (10) in die Bohrung (2) verbunden ist.13. The apparatus according to claim 12, characterized in that the connection for the addition of biomass (19a) via an additional line (23) with the line system (11) for returning the cleaned floor (10) in the bore (2) is connected .
EP89110399A 1988-07-05 1989-06-08 Method and device for the sanitation of contaminated sites Expired - Lifetime EP0349789B1 (en)

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AT89110399T ATE81693T1 (en) 1988-07-05 1989-06-08 METHOD AND DEVICE FOR REMEDIATION OF CONTAMINATED SITES.

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DE3822747 1988-07-05
DE19883822747 DE3822747A1 (en) 1988-07-05 1988-07-05 Method and apparatus for cleaning contaminated sites
DE3900513A DE3900513A1 (en) 1988-07-05 1989-01-10 METHOD AND DEVICE FOR RESTORING CONTAMINATED LOCATIONS
DE3900513 1989-01-10

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DE4003362A1 (en) * 1990-02-05 1991-08-08 Keller Grundbau Gmbh METHOD AND DEVICE FOR IN-SITU RESTORATION OF CONTAMINATED AREAS
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DE4003362A1 (en) * 1990-02-05 1991-08-08 Keller Grundbau Gmbh METHOD AND DEVICE FOR IN-SITU RESTORATION OF CONTAMINATED AREAS
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WO1994014720A1 (en) * 1992-12-26 1994-07-07 Gebr. Huber Gesellschaft Für Versorgungs- Und Geotechnik Mbh Process and device for producing concrete building components and concrete building components

Also Published As

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EP0349789B1 (en) 1992-10-21
US5098224A (en) 1992-03-24
DE3900513A1 (en) 1990-07-12
EP0349789A3 (en) 1990-10-31
DE58902492D1 (en) 1992-11-26

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